Hey

I was trying to get some info on my TCM FHG36N8
Ser. 46400759 Nissan H30

Would like to know the year model and if "N8" means 8000lb and if a "N9" is the same truck just 9000lb??? I've been looking for a EPC online to no avail but have found one for download but only for fhg36N9?? Same truck?? Whats the model identification F-fork G-gas....??? The truck runs great but want to recommission for light
everyday use. Just need service items. Water pump, hoses, tstat, radiator. Stuff thats forty years old and needs replaced.. any help would be greatly appreciated!! Thank you